AirPlay (Mac)
Currently, Downcast for macOS does not have built in support for Airplay. However, you can change your Mac's audio output to output to an airplay device by option + clicking the volume icon in macOS' menu bar and selecting an output device.
Additionally, Downcast's audio, video and interface can be used over AirPlay through OS X's AirPlay mirroring: http://support.apple.com/kb/ht5404
Built-in Airplay support is coming in the next major version, v3.0
